Catalytic oxidation of polyethylene with oxygen under solid‐state conditions

Zawadiak, Jan; Marek, A.; Orlińska, Beata; Stec, Zbigniew

doi:10.1002/app.32387

Cited by 13 publications

(12 citation statements)

References 26 publications

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“…18 A product with an AN about 20 mg KOH/g was obtained in the process carried out in aqueous dispersion at 120 C under 8 bars of oxygen pressure after 15 h of reaction (in solid phase about 35 h was needed). 18 A product with an AN about 20 mg KOH/g was obtained in the process carried out in aqueous dispersion at 120 C under 8 bars of oxygen pressure after 15 h of reaction (in solid phase about 35 h was needed).…”

Section: Discussionmentioning

confidence: 99%

“…In the previous work, 18 we presented the studies on the influence of process parameters and selected transition metal compounds on the oxidation process of powdered HDPE in the solid phase using air. In this system, use of oxygen that leads to increase the reaction rate is limited by the possibility of explosion of powdered polyethylene-oxygen mixture.…”

Section: Introductionmentioning

confidence: 99%

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Catalytic oxidation of polyethylene with oxygen in aqueous dispersion

Zawadiak

Orlińska

Marek

2012

J of Applied Polymer Sci

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The oxidative degradation of polyethylene in aqueous dispersion was studied. The influences of different parameters as well as additives on polyethylene oxidation were investigated. The products obtained in noncatalytic and catalyzed by transition metal salts oxidation processes were compared and characterized by the determination of acid number as well as by means of ICP-OES, GPC analysis, and FTIR spectroscopy. The obtained results have shown that the catalytic processes using manganese(II) or cobalt(II) acetylacetonate proceeded with two to three times higher rate than process without catalysts. Moreover, the FTIR spectroscopy and GPC analysis confirmed similar properties of final product obtained both in noncatalytic and catalytic processes. Another advantage of this process is a very low content of catalyst in product $ 0.001-0.003% of metal used. V C 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 127: 976-981, 2013

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Catalytic oxidation of polyethylene with oxygen in aqueous dispersion

Zawadiak

Orlińska

Marek

2012

J of Applied Polymer Sci

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“…Al/Fe ratio cocatalyst/catalyst ratio Al-O-PE aluminum alkoxide Al-PE (chain elongated) aluminum alkyl BIP (iron) bisimino pyridine ligand/(bisimino pyridine iron complex) CCTP coordinative chain transfer polymerization CTA chain transfer agent MAO methyl aluminoxane NMR nuclear magnetic resonance PE polyethylene PE-OH hydroxyl-functionalized polyethylene SEC size exclusion chromatography TCB 1,2,4-trichlorobenzene TCE-d 2 1,1,2,2-tetrachlorethan-d 2 X PE mole fraction of non-functionalized polyethylene (paraffin) X PE-OH mole fraction of hydroxyl-functionalized polyethylene X a mole fraction of vinylic polyethylene (a-olefin)…”

Section: Abbreviationsmentioning

confidence: 99%

“…Polyethylenes are typically not easily functionalized at specific positions in a post‐polymerization reaction . In addition, the options to arrive at terminally functional products during ethylene polymerization are limited because of the type of reagents that are compatible with the highly reactive olefin polymerization catalysts .…”

Section: Introductionmentioning

confidence: 99%

“…Polyethylenes are typically not easily functionalized at specific positions in a post-polymerization reaction. [1][2][3][4][5] In addition, the options to arrive at terminally functional products during ethylene polymerization are limited because of the type of reagents that are compatible with the highly reactive olefin polymerization catalysts. [6,7] Nevertheless, such end-functionalized poly-and oligo-ethylenes are highly useful for adapting the properties, especially the surface properties (chemically and physically), as such polymers with hydrophilic functional groups usually separate from the bulk.…”

Section: Introductionmentioning

confidence: 99%

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Facile Synthesis of Hydroxyl‐Terminated Oligoethylenes

Meyer

Scholtyssek

Luinstra

2014

Macro Materials & Eng

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The synthesis of terminal hydroxyl-functionalized oligoethylene is achieved in a two-step one-pot method. Aluminum long chain alkyls (Al-PE) were generated by a catalytic chain transfer reaction involving iron 2,6-bis(imino)pyridyl ligation catalysts and methyl aluminoxane (MAO) aluminum alkyl precursors. At a high catalyst/cocatalyst ratio (>5 000) and a low ethylene pressure (1 bar) the chain transfer to aluminum is the dominant termination step. Discharging oxygen or dry air into the post polymerization reaction mixture leads to aluminum alkoxides (Al-O-PE) and after hydrolysis to hydroxyl-functionalized polyethylene (PE-OH). The degree of oxy-functionalization (up to 88 AE 3%) increased with increasing oxygen pressure and temperature and was more efficient with aluminum alkyls with a lower molecular weight.

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Valorization of polyethylene degradation products by blending with PHB biopolyester

Kwiecień

Musioł

Sobota

et al. 2016

J of Chemical Tech & Biotech

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BACKGROUND: The biodegradation process of conventional plastics is very slow and can take dozens of years to achieve complete degradation. In order to improve current plastic waste management, research has been focused on identifying the possible routes for using oligomers and degradation products obtained from enzymatic depolymerization/transformation of conventional plastics as building blocks to produce eco-friendly polymeric materials with improved biodegradability and good mechanical properties. RESULTS:We report a possible route for the utilization of polyethylene (PE) oligomers obtained from the degradation of polyethylene to produce new eco-friendly polymeric materials. Polyethylene oligomers containing functional groups such as carboxylic, aldehyde, ketone, ether or ester were used to prepare polymeric blends with poly(3-hydroxybutyrate) (PHB) biopolyester. Polymeric blends of PHB which contained 10, 20 and 30% of oxidized polyethylene oligomers with different acidic numbers were prepared and characterized . CONCLUSIONS:The results obtained show that the addition of oxidized PE oligomers to PHB biopolyester improves the mechanical properties of the prepared polymeric materials. A beneficial composition was found for the blend: PHB/oxPE 90/10 (w/w). Moreover, biodegradation tests indicated that the polymeric blends undergo biodegradation, which shows their potential application as new, eco-friendly polymeric materials with a predicted biodegradation rate.

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Catalytic oxidation of polyethylene with oxygen under solid‐state conditions

Cited by 13 publications

References 26 publications

Catalytic oxidation of polyethylene with oxygen in aqueous dispersion

Catalytic oxidation of polyethylene with oxygen in aqueous dispersion

Facile Synthesis of Hydroxyl‐Terminated Oligoethylenes

Valorization of polyethylene degradation products by blending with PHB biopolyester

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